VERB
疏浚;清淤;挖掘
When people dredge a harbour, river, or other area of water, they remove mud and unwanted material from the bottom with a special machine in order to make it deeper or to look for something.
例句
Police have spent weeks dredging the lake but have not found his body.
警方已经花了数周对湖底清淤,但还是没有发现他的尸体。